Another oil question

[zirconxi_imp]

Mix them if you already have 10w-30 that you don't want to waste.

Just use 10w-40 if you don't have any 10w-30.

My understanding is that you can always mix different specs, but mineral with mineral and synthetic with synthetic.

Isn't mixing mineral and synthetic and it should give you semi synthetic???

[peterbaron]

........
These articles may also interest you and others, Google is your friend:

https://blog.amsoil.com/synthetic-vs-conventional-oil/

https://www.zigwheels.com/guide/oil-guid...ils/19084/

https://www.oildepot.ca/mixing-motor-oil...s-related/

[Speed_imp]

Mixing different oils is not recommended because they could use different additives and they could not get on well. It is a chemical thing, mixing them could create laques or muds.